crypto/dh/dh_lib.c

   1 /* crypto/dh/dh_lib.c */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58
  59 #include <stdio.h>
  60 #include "cryptlib.h"
  61 #include <openssl/bn.h>
  62 #include <openssl/dh.h>
  63 #include <openssl/engine.h>
  64
  65 const char *DH_version="Diffie-Hellman" OPENSSL_VERSION_PTEXT;
  66
  67 static const DH_METHOD *default_DH_method = NULL;
  68
  69 void DH_set_default_method(const DH_METHOD *meth)
  70         {
  71         default_DH_method = meth;
  72         }
  73
  74 const DH_METHOD *DH_get_default_method(void)
  75         {
  76         if(!default_DH_method)
  77                 default_DH_method = DH_OpenSSL();
  78         return default_DH_method;
  79         }
  80
  81 int DH_set_method(DH *dh, const DH_METHOD *meth)
  82         {
  83         /* NB: The caller is specifically setting a method, so it's not up to us
  84          * to deal with which ENGINE it comes from. */
  85         const DH_METHOD *mtmp;
  86         mtmp = dh->meth;
  87         if (mtmp->finish) mtmp->finish(dh);
  88         if (dh->engine)
  89                 {
  90                 ENGINE_finish(dh->engine);
  91                 dh->engine = NULL;
  92                 }
  93         dh->meth = meth;
  94         if (meth->init) meth->init(dh);
  95         return 1;
  96         }
  97
  98 DH *DH_new(void)
  99         {
 100         return DH_new_method(NULL);
 101         }
 102
 103 DH *DH_new_method(ENGINE *engine)
 104         {
 105         DH *ret;
 106
 107         ret=(DH *)OPENSSL_malloc(sizeof(DH));
 108         if (ret == NULL)
 109                 {
 110                 DHerr(DH_F_DH_NEW_METHOD,ERR_R_MALLOC_FAILURE);
 111                 return(NULL);
 112                 }
 113
 114         ret->meth = DH_get_default_method();
 115         if (engine)
 116                 {
 117                 if (!ENGINE_init(engine))
 118                         {
 119                         DHerr(DH_F_DH_NEW_METHOD, ERR_R_ENGINE_LIB);
 120                         OPENSSL_free(ret);
 121                         return NULL;
 122                         }
 123                 ret->engine = engine;
 124                 }
 125         else
 126                 ret->engine = ENGINE_get_default_DH();
 127         if(ret->engine)
 128                 {
 129                 ret->meth = ENGINE_get_DH(ret->engine);
 130                 if(!ret->meth)
 131                         {
 132                         DHerr(DH_F_DH_NEW_METHOD,ERR_R_ENGINE_LIB);
 133                         ENGINE_finish(ret->engine);
 134                         OPENSSL_free(ret);
 135                         return NULL;
 136                         }
 137                 }
 138
 139         ret->pad=0;
 140         ret->version=0;
 141         ret->p=NULL;
 142         ret->g=NULL;
 143         ret->length=0;
 144         ret->pub_key=NULL;
 145         ret->priv_key=NULL;
 146         ret->q=NULL;
 147         ret->j=NULL;
 148         ret->seed = NULL;
 149         ret->seedlen = 0;
 150         ret->counter = NULL;
 151         ret->method_mont_p=NULL;
 152         ret->references = 1;
 153         ret->flags=ret->meth->flags;
 154         CRYPTO_new_ex_data(CRYPTO_EX_INDEX_DH, ret, &ret->ex_data);
 155         if ((ret->meth->init != NULL) && !ret->meth->init(ret))
 156                 {
 157                 if (ret->engine)
 158                         ENGINE_finish(ret->engine);
 159                 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DH, ret, &ret->ex_data);
 160                 OPENSSL_free(ret);
 161                 ret=NULL;
 162                 }
 163         return(ret);
 164         }
 165
 166 void DH_free(DH *r)
 167         {
 168         int i;
 169         if(r == NULL) return;
 170         i = CRYPTO_add(&r->references, -1, CRYPTO_LOCK_DH);
 171 #ifdef REF_PRINT
 172         REF_PRINT("DH",r);
 173 #endif
 174         if (i > 0) return;
 175 #ifdef REF_CHECK
 176         if (i < 0)
 177                 {
 178                 fprintf(stderr,"DH_free, bad reference count\n");
 179                 abort();
 180         }
 181 #endif
 182
 183         if (r->meth->finish)
 184                 r->meth->finish(r);
 185         if (r->engine)
 186                 ENGINE_finish(r->engine);
 187
 188         CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DH, r, &r->ex_data);
 189
 190         if (r->p != NULL) BN_clear_free(r->p);
 191         if (r->g != NULL) BN_clear_free(r->g);
 192         if (r->q != NULL) BN_clear_free(r->q);
 193         if (r->j != NULL) BN_clear_free(r->j);
 194         if (r->seed) OPENSSL_free(r->seed);
 195         if (r->counter != NULL) BN_clear_free(r->counter);
 196         if (r->pub_key != NULL) BN_clear_free(r->pub_key);
 197         if (r->priv_key != NULL) BN_clear_free(r->priv_key);
 198         OPENSSL_free(r);
 199         }
 200
 201 int DH_up_ref(DH *r)
 202         {
 203         int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_DH);
 204 #ifdef REF_PRINT
 205         REF_PRINT("DH",r);
 206 #endif
 207 #ifdef REF_CHECK
 208         if (i < 2)
 209                 {
 210                 fprintf(stderr, "DH_up, bad reference count\n");
 211                 abort();
 212                 }
 213 #endif
 214         return ((i > 1) ? 1 : 0);
 215         }
 216
 217 int DH_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
 218              CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)
 219         {
 220         return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_DH, argl, argp,
 221                                 new_func, dup_func, free_func);
 222         }
 223
 224 int DH_set_ex_data(DH *d, int idx, void *arg)
 225         {
 226         return(CRYPTO_set_ex_data(&d->ex_data,idx,arg));
 227         }
 228
 229 void *DH_get_ex_data(DH *d, int idx)
 230         {
 231         return(CRYPTO_get_ex_data(&d->ex_data,idx));
 232         }
 233
 234 int DH_size(const DH *dh)
 235         {
 236         return(BN_num_bytes(dh->p));
 237         }